EP1000725B1 - Vorrichtung und Verfahren zum Pressformen eines Produktes - Google Patents

Vorrichtung und Verfahren zum Pressformen eines Produktes Download PDF

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Publication number
EP1000725B1
EP1000725B1 EP99309114A EP99309114A EP1000725B1 EP 1000725 B1 EP1000725 B1 EP 1000725B1 EP 99309114 A EP99309114 A EP 99309114A EP 99309114 A EP99309114 A EP 99309114A EP 1000725 B1 EP1000725 B1 EP 1000725B1
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EP
European Patent Office
Prior art keywords
mold
plug
temperature
gap
thermal expansion
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Expired - Lifetime
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EP99309114A
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English (en)
French (fr)
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EP1000725A1 (de
Inventor
Paul Shadforth Thompson
Johannes Martinus Vanoort
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General Electric Co
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General Electric Co
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B29C43/10—Isostatic pressing, i.e. using non-rigid pressure-exerting members against rigid parts or dies
    • B29C43/102—Isostatic pressing, i.e. using non-rigid pressure-exerting members against rigid parts or dies using rigid mould parts specially adapted for moulding articles having an axis of symmetry
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
    • B29C33/3828—Moulds made of at least two different materials having different thermal conductivities
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B29C43/027—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles having an axis of symmetry
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/40—Shaping or impregnating by compression not applied
    • B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
    • B29C70/44—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using isostatic pressure, e.g. pressure difference-moulding, vacuum bag-moulding, autoclave-moulding or expanding rubber-moulding
    • B29C70/446—Moulding structures having an axis of symmetry or at least one channel, e.g. tubular structures, frames
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/40—Shaping or impregnating by compression not applied
    • B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
    • B29C70/46—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs
    • B29C70/462—Moulding structures having an axis of symmetry or at least one channel, e.g. tubular structures, frames
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C2043/3205—Particular pressure exerting means for making definite articles
    • B29C2043/3261—Particular pressure exerting means for making definite articles thermal expansion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/36—Moulds for making articles of definite length, i.e. discrete articles
    • B29C43/3642—Bags, bleeder sheets or cauls for isostatic pressing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2023/00—Tubular articles
    • B29L2023/22—Tubes or pipes, i.e. rigid

Definitions

  • the present invention generally relates to compression molding and, more particularly, is concerned with an apparatus and method for producing a compression molded product.
  • a body of material is typically placed directly in a cavity of the mold of a die set and compression molding takes place under application of pressure with the plug of the die set. See for example US-A-5 560 883 and US-A-5 084 219.
  • Many fiber-reinforced composite structures are formed using this process. See for example EP-A-0 862 978.
  • the reinforcing fibers are surface treated by impregnation to enhance adhesion to the polymer matrix. See for example EP-A-0 415 207 The resulting partially cured material is commonly called a prepreg.
  • Pressure is applied to the mold and/or plug of the die set to accomplish the compression into the desired form of the prepreg lay-up in the mold.
  • Pressure can be applied by a vacuum-bagging technique wherein the pressure required to form the shape and create good bonding is obtained by covering the lay-up prepreg with a plastic bag and then creating a vacuum in the mold cavity. Heat is also applied to fully cure the material. If additional heat and pressure are desired, the entire die set and prepreg are placed in an autoclave.
  • the present invention provides a compression molding apparatus and method designed to satisfy the aforementioned need.
  • the compression molding apparatus and method of the present invention employs thermal expansion differential between the plug and mold of the molding die set to produce the pressure necessary to make structures with repeatable results ensuring a quality finished product.
  • the molding apparatus and method of the present invention eliminates the need for vacuum-bagging and autoclaving to produce the required pressure and temperature to cure the fiber-reinforced composite prepreg structure.
  • a compression molding apparatus comprising a mold made of a first material having a first coefficient of thermal expansion; a plug made of a second material having a second coefficient of thermal expansion different from said first coefficient of thermal expansion of said first material of said mold, one of said mold and plug having a cavity into which the other of said mold and plug is placed disposed relative to the other along a central longitudinal axis with a gap between said mold and plug having a first volume which is suitable for holding a body of a third material different from the first and second materials with the body at least partially filling said gap when said mold and plug are at a first temperature to mold the body into a molded product when said mold and plug are subjected to a second temperature causing one of said first and second materials of said mold and plug to change in size more than the other and thereby change said gap to a second volume different from said first volume, the body being compressed between said mold and plug into the molded product; characterised in that a plurality of pins circumferentially spaced apart and
  • the second coefficient of thermal expansion of the second material of the plug is greater than the first coefficient of thermal expansion of the first material of the mold such that the first material of the mold expands during the change in temperature from the first temperature to the second temperature but to a lesser degree than the second material of the plug during the change in temperature from the first temperature to the second temperature.
  • the second temperature is greater than the first temperature.
  • the first temperature can be about room temperature whereas the second temperature can be about 121° C (250° F).
  • the third material of the body can be a composite structure, such as a structure having graphite fibers embedded in an epoxy matrix.
  • the present invention also provides a compression molding method comprising the steps of providing a mold of a first material having a first coefficient of thermal expansion and defining a cavity; providing a plug of a second material having a second coefficient of thermal expansion different from the first coefficient of thermal expansion; positioning the mold relative to the plug such that the one is disposed relative to the other along a central longitudinal axis so as to provide a gap between the mold and plug with a body of a third material different from the first and second materials of the mold and plug disposed in the gap therebetween and at a first temperature such that the gap has a first volume and the body at least partially fills the gap; subjecting the mold and plug to a second temperature different from the first temperature so as to cause one of the first material of the mold and the second material of the plug to change in size relative to the other and thereby change the gap to a second volume different from the first volume and in a transverse direction to the central longitudinal axis and compress the body between the mold and plug into a molded product, wherein the change in the volume of
  • the compression molding apparatus 10 basically includes a die set 12 having a mold 14 and a plug 16 wherein the mold 14 is made of a first material having a first coefficient of thermal expansion and the plug 16 is made of a second material having a second coefficient of thermal expansion different from the first coefficient of thermal expansion.
  • the mold 14 has an internal cavity 18 permitting the mold 14 to be disposed over and removed from the plug 16 such that an air gap 20 having a first volume is established between the mold 14 and plug 16 when the mold 14 is disposed over the plug 16 and they are at a first temperature, such as room temperature or about 23.9° C (75° F).
  • the mold 14 is fixtured by circumferentially spaced pins 22 to the plug 16 such that the mold 14 and plug 16 are accurately positioned with respect to each other and further such that at the first, or room, temperature the air gap 20 of the first volume exists between the interior surface 14a of the mold 14 and a portion of the exterior surface 16a of the plug i 6.
  • a body 24 of a third material, different from the first and second materials of the mold 14 and plug 16, is provided for molding into a finished product when subjected to the differential thermal expansion between the mold 14 and plug 16.
  • the third material can be any moldable material such as, but not limited to, a plastic material or a composite material, such as a composite material having graphite fibers embedded in an epoxy matrix wherein the body 24 is (although not required to be) a graphite fiber prepreg. Before the mold 14 is positioned over the plug 16, the prepreg body 24 is laid onto the plug 16 to assume the position as shown in FIG. 1.
  • the body 24 at least partially fills the air gap 20 between the mold 14 and plug 16 when the plug 16 is disposed within the internal cavity 18 of the mold 14 at the first temperature, as shown in FIG. 1.
  • the body 24 is compressed to a configuration and predetermined size by the differential thermal change, such as expansion, between the mold 14 and plug 16 as the mold 14 and plug 16 are changed from the first temperature to a second temperature, such as 121° C (250° F).
  • the temperature change during the "cure” causes one of the first and second materials of the mold 14 and plug 16 to change, expand or contract depending upon the materials, such that the air gap 20 decreases from the larger first volume to the smaller second volume and the body 24 is compressed between the mold 14 and plug 16, as shown in FIG. 2.
  • the change in the volume of the gap 20 is caused essentially only by the change in temperature.
  • the mold 14 can have a substantially clam shell-type construction, though it may have any other suitable construction, so that it can be opened and closed over the plug 16 permitting insertion or laying of the prepreg body 24 onto the plug 16 and removal of the molded product therefrom.
  • the mold 14 and plug 16 can have any suitable sizes.
  • the mold 14 can be made of carbon steel while the plug 16 can be made of stainless steel.
  • the mold 14 and plug 16 can be of right cylindrical shapes, although other shapes can be utilized. Complicated shapes can be molded using plugs that can be taken apart. The plug 16 could have a slight taper to allow the molded product to be pushed off without the possibility of structural damage.
  • the first material of the mold 14 must be of sufficient strength to constrain the plug 16 during thermal expansion thereof.
  • the cavity 18 of the mold 14 also has a desired configuration as defined by the interior surface 14a of the mold 14 so as to provide the desired outside geometry of the finished composite structure.
  • the outside geometry is formed, such as by machining, onto the interior surface 14a of the mold 14.
  • the first material of the mold 14 is carbon steel
  • the first coefficient of thermal expansion is 1.17 x 10- 5 /° C (6.5 x 10 -6 in/in ° F).
  • the second material of the plug 16 is stainless steel
  • the second coefficient of thermal expansion is 1.8 x 10- 5 /° C (10.0 x 10 -6 in/in °F) and thus is greater than the first coefficient of thermal expansion of the first material.
  • the first material of the mold 14 will change as the temperature changes from the first temperature to the second temperature but to a lesser degree than the second material of the plug 16 as the temperature changes from the first temperature to the second temperature.
  • the second temperature is greater than the first temperature whereby the differential change in size that occurs is a greater expansion of the second material of the plug 16 than of the first material of the mold 14.
  • the first temperature may be room temperature.
  • the second temperature may be 121 °C (250°F).
  • ⁇ is the coefficient of thermal expansion
  • ⁇ T is the temperature difference (T 2 -T 1 )
  • T 1 is the first temperature
  • T 2 is the second temperature
  • L 1 is the length of the material at the first temperature
  • L 2 is the length of the material at the second temperature
  • the mold 14 is fixtured to the plug 16 at lower end portions 14b, 16b thereof such that the respective surfaces 14c, 16c on the lower end portion 14b, 16b of the mold 14 and plug 16 are maintained substantially flush in relation to one another.
  • the mold 14 and the plug 16 may be fixtured to one another by any suitable means, such as by the pins 22.
  • the fixturing of the mold 14 to the plug 16 is necessary for accuracy in positioning them in relation to one another.
  • the air gap 20 existing between the mold 14 and plug 16 can have any suitable size and configuration depending upon the size of the body 24 and amount of differential thermal expansion that is to occur. Before curing begins, the body 24 has an initial predetermined configuration.
  • the exterior surface 24a of the body 24 takes on the configuration of the interior surface 14a of the mold 14 while the interior surface 24b of the body 24 takes on the configuration of the exterior surface 16a of the plug 16.
  • the body 24 may, therefore, take on any desired and suitable configuration, depending upon the configurations of the mold 14 and the plug 16.
  • the third material of the body 24 is a composite structure.
  • the composite structure of the body 24 is reinforced by fiber, such as by graphite fiber.
  • the compression molding method employing the apparatus 10 includes the steps of providing the mold 14 of the first material having the first coefficient of thermal expansion and defining the internal cavity 18, providing the plug 16 of the second material having the second coefficient of thermal expansion, and positioning the mold 14 relative to the plug 16 with the body 24 in the cavity 18 of the mold 14 and at a first temperature such that an air gap 20 having a first volume is established between the mold 14 and plug 16 and the body 24 at least partially fills the air gap 20.
  • the first temperature is then changed to a second temperature so as to cause one of the first material of the mold 14 and the second material of the plug 16 to expand relative to the other and thereby decrease the volume of the air gap 20 and compress the body 24 to a predetermined size and configuration between the mold 14 and plug 16.
  • the change in the volume of the gap 20 is caused essentially only by the change in temperature.
  • the step of changing from the first to the second temperature causes expansion of the first material of the mold 14 but to a lesser degree than the expansion of the second material of the plug 16.
  • the mold 14 must be removed from the plug 16 and the body 24 after curing at the second temperature because the body 24 may not shrink as much as the mold 14 in the process of going from the second to the first temperature. Pressures greater than 689 kPa (100 psi) can be achieved through this method of compression molding.
  • the above described compression molding process could be carried out in a vacuum or after the molding process, the air could be extracted from the molding apparatus 10 in which case the air gap 20 would be referred to as a gap or a vacuum gap 20.
  • the air gap 20 would be referred to as a gap or a vacuum gap 20.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Manufacturing & Machinery (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Claims (15)

  1. Pressformvorrichtung (10)
    mit einer Pressform (14) die aus einem ersten Material hergestellt ist, das einen ersten Wärmeausdehnungskoeffizienten aufweist;
    mit einem Pressstempel (16), der aus einem zweiten Material hergestellt ist, das einen zweiten Wärmeausdehnungskoeffizienten aufweist, der sich von dem ersten Wärmeausdehnungskoeffizienten des ersten Materials der Pressform (14) unterscheidet, wobei entweder die Pressform (14) oder der Pressstempel (16) einen Hohlraum (18) aufweist, in dem das andere Element, also die Pressform (14) oder der Pressstempel (16), eingesetzt ist, wobei beide in Bezug aufeinander um eine zentrale Längsachse mit einem Zwischenraum (20) zwischen der Pressform (14) und dem Pressstempel (16) angeordnet sind, wobei der Zwischenraum ein erstes Volumen aufweist, das geeignet ist, einen Körper (24) aus einem dritten Material aufzunehmen, das sich von dem ersten und dem zweiten Material unterscheidet, wobei der K6rper (24) wenigstens teilweise den Zwischenraum (20) füllt, wenn die Pressform (14) und der Pressstempel (16) sich bei einer ersten Temperatur befinden, um den Körper (24) zu einem formgepressten Produkt zu formen, wenn die Pressform (14) und der Pressstempel (16) einer zweiten Temperatur ausgesetzt werden, die bewirkt, dass entweder das erste oder das zweite Material der Pressform (14) und des Pressstempels (16) seine Größe mehr als das andere Material verandert und dadurch der Zwischenraum (20) zu einem zweiten Volumen verändert, das sich von dem ersten Volumen unterscheidet, wobei der Körper (24) zwischen der Pressform (14) und dem Pressstempel (16) zu dem pressgeformten Produkt zusammengepresst wird; dadurch gekennzeichnet, dass
    mehrere Zapfen (22) in Umfangsrichtung voneinander beabstandet angeordnet sind und sich in einer Querrichtung relativ zu der zentralen Längsachse erstrecken und geeignet sind, um die Pressform (14) an dem Pressstempel (16) zu fixieren, wobei der Pressform (14) und dem Pressstempel (16) durch die Zapfen ermöglicht ist, eine relative Ausdehnung und Kontraktion in Richtung aufeinander zu und voneinander weg zu erfahren, wobei die Zapfen (22) sich durch und über einen Abschnitt des Zwischenraums (20) zwischen der Pressform (14) und dem Pressstempel (16) an der Stelle der Zapfen (22) erstrecken, wenn die Pressform (14) und der Pressstempel (16) sich bei der ersten Temperatur befinden, und wobei die Zapfen (22) geeignet sind, um zuzulassen, dass sich die Größe des Zwischenraums (20) an den Stellen der Zapfen (22) verändert, wenn die Pressform (14) und der Pressstempel (16) sich von der ersten Temperatur zu der zweiten Temperatur verändern.
  2. Vorrichtung (10) nach Anspruch 1, wobei die Pressform (14) geeignet ist, um über dem Pressstempel (16) angeordnet und hiervon entfernt zu werden, wobei der Zwischenraum (20) mit dem ersten Volumen zwischen der Pressform (14) und dem Pressstempel (16) freigelassen ist, wenn die Pressform (14) über dem Pressstempel (16) angeordnet ist.
  3. Vorrichtung (10) nach Anspruch 1 oder 2, bei der das erste Material der Pressform (14) durch Kohlenstoffstahl gebildet ist, während das zweite Material des Pressstempels (16) durch nichtrostenden Stahl gebildet ist.
  4. Vorrichtung (10) nach Anspruch 1, 2 oder 3, bei der der zweite Wärmeausdehnungskoeffizient des zweiten Materials des Pressstempels (16) größer ist als der erste Wärmeausdehnungskoeffizient des ersten Materials der Pressform (14).
  5. Vorrichtung (10) nach Anspruch 1, bei der die Pressform (14) und der Pressstempel (16) eine zylindrische Konfiguration aufweisen.
  6. Pressformverfahren, das die Schritte aufweist, dass
    eine Pressform (14) aus einem ersten Material bereitgestellt wird, die einen ersten Wärmeausdehnungskoeffizienten aufweist und einen Hohlraum (18) definiert;
    ein Pressstempel (16) aus einem zweiten Material bereitgestellt wird, das einen zweiten Wärmeausdehnungskoeffizienten aufweist, der sich von dem ersten Wärmeausdehnungskoeffizienten unterscheidet;
    die Pressform (14) in Bezug auf den Pressstempel (16) derart positioniert wird, dass das eine Element in Bezug auf das andere Element über einer zentralen Längsachse derart angeordnet ist, um einen Zwischenraum (20) zwischen der Pressform (14) und dem Pressstempel (16) zu schaffen, wobei ein Körper (24) aus einem dritten Material, das sich von dem ersten und dem zweiten Material der Pressform (14) und des Pressstempels (16) unterscheidet, in den Zwischenraum zwischen diesen und bei einer ersten Temperatur derart angeordnet wird, dass der Zwischenraum (20) ein erstes Volumen aufweist und der Körper (24) wenigstens teilweise den Zwischenraum (20) ausfüllt;
    die Pressform (14) und der Pressstempel (16) einer zweiten Temperatur ausgesetzt werden, die sich von der ersten Temperatur unterscheidet, um zu bewirken, dass entweder das erste Material der Pressform (14) oder das zweite Material des Pressstempels (16) seine Größe in Bezug auf das andere verändert und sich dadurch der Zwischenraum (20) zu einem zweiten Volumen, das sich von dem ersten Volumen unterscheidet, sowie in einer zu der zentralen Längsachse quer verlaufenden Richtung verändert und der Körper (24) zwischen der Pressform (14) und dem Pressstempel (16) zu einem pressgeformten Produkt zusammengepresst wird, wobei die Volumenänderung des Zwischenraums (20) im Wesentlichen nur durch die Temperaturänderung bewirkt wird; und
    mehrere Zapfen (22) vorgesehen werden, die in Umfangsrichtung voneinander beabstandet angeordnet sind und sich in einer Querrichtung in Bezug auf die zentrale Längsachse erstrecken, um die Pressform (14) an dem Pressstempel (16) derart zu fixieren, dass der Pressform (14) und dem Pressstempel (16) ermöglicht ist, eine relative Expansion und Kontraktion in Richtung aufeinander zu und voneinander weg durch die Zapfen (22) zu erfahren, die sich durch und über einen Abschnitt des Zwischenraums (20) zwischen der Pressform (14) und dem Pressstempel (16) an einer Stelle der Zapfen (22) erstrecken, wenn die Pressform (14) und der Pressstempel (16) sich bei der ersten Temperatur befinden, und die es zulassen, dass sich die Größe des Zwischenraums (20) an den Stellen der Zapfen (22) verändert, wenn die Pressform (14) und der Pressstempel (16) von der ersten Temperatur zu der zweiten Temperatur verändert werden.
  7. Verfahren nach Anspruch 6, bei dem die Positionierung der Pressform (14) den Schritt enthält, dass die Pressform (14) über dem Pressstempel (16) derart angeordnet wird, dass der Zwischenraum (20) mit dem ersten Volumen zwischen der Pressform (14) und dem Pressstempel (16) vorliegt, wenn die Pressform (14) über dem Pressstempel (16) angeordnet ist.
  8. verfahren nach Anspruch 6 oder 7, bei dem das erste Material der Pressform (14) durch Kohlenstoffstahl gebildet ist, während das zweite Material des Pressstempels (16) durch nichtrostenden Stahl gebildet ist.
  9. Verfahren nach Anspruch 6, 7 oder 8, bei dem der zweite Wärmeausdehnungskoeffizient des zweiten Materials des Pressstempels (16) größer ist als der erste Wärmeausdehnungskoeffizient des ersten Materials der Pressform (14).
  10. Verfahren nach einem beliebigen der Ansprüche 6 bis 9, bei dem die zweite Temperatur größer ist als die erste Temperatur.
  11. Verfahren nach einem beliebigen der Ansprüche 6 bis 10, bei dem die erste Temperatur, bei der der Zwischenraum (20) das erste Volumen aufweist, durch Raumtemperatur gebildet ist.
  12. Verfahren nach einem beliebigen der Ansprüche 6 bis 11, bei dem die zweite Temperatur, bei der der Zwischenraum (20) das zweite Volumen aufweist, im Wesentlichen 121°C (250°F) beträgt.
  13. Verfahren nach einem beliebigen der Ansprüche 6 bis 12, bei dem das dritte Material des Körpers (24) durch ein Verbundwerkstoff gebildet ist.
  14. Verfahren nach einem beliebigen der Ansprüche 6 bis 13, bei dem der Verbundwerkstoff des Körpers (24) Verstärkungsfasern enthält.
  15. Verfahren nach einem beliebigen der Ansprüche 6 bis 14, bei dem die Pressform (14) und der Pressstempel (16) in Form zylindrischer Konfigurationen bereitgestellt werden.
EP99309114A 1998-11-16 1999-11-16 Vorrichtung und Verfahren zum Pressformen eines Produktes Expired - Lifetime EP1000725B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US193085 1998-11-16
US09/193,085 US6174484B1 (en) 1998-11-16 1998-11-16 Apparatus and method for producing a compression molded product

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JP4616659B2 (ja) * 2005-02-08 2011-01-19 東邦テナックス株式会社 一面が開口したｆｒｐ製の中空の直方体の成形方法及び成形用金型
DE102009020190B3 (de) * 2009-05-07 2010-09-09 Eads Deutschland Gmbh Vorrichtung zur Formgebung eines Werkstücks
FR2958875B1 (fr) * 2010-04-20 2017-07-07 Snecma Dispositif de fabrication d'un carter en materiau composite et procede de fabrication mettant en oeuvre un tel dispositif
FR2971195B1 (fr) * 2011-02-04 2013-04-26 Latecoere Outillage de moulage pour la realisation d'une piece en materiau composite au moyen d'une preforme souple composee d'une peau et de preformes profilees solidarisees sur la dite peau.
US9415553B2 (en) * 2011-05-04 2016-08-16 Compagnie Generale Des Etablissements Michelin Apparatus and method for curing a rubber like article
SE536006C2 (sv) * 2011-06-17 2013-03-26 Examec Holding Ab Fastsättning av del på axeltapp av kompositmaterial
EP2948288B1 (de) * 2013-01-24 2018-09-19 Toyota Motor Europe Verfahren zum herstellen eines bauteils mit einer form mit dickerer wandstärke und wärmeleitendem material
TWI499499B (zh) * 2013-10-07 2015-09-11 Advanced Int Multitech Co Ltd Method of manufacturing composite shell
JP5896251B2 (ja) * 2014-08-21 2016-03-30 有限会社北鉄工所 プレス成形装置
CN104647700B (zh) * 2015-02-13 2017-06-13 山东华信塑胶股份有限公司 一种用于制造微r槽承口的模芯
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WO2016195633A1 (en) * 2015-05-29 2016-12-08 Compagnie Generale Des Etablissements Michelin Curing device for polymeric materials using thermal expansion
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DE69929944D1 (de) 2006-04-27
JP2000141391A (ja) 2000-05-23
US6174484B1 (en) 2001-01-16
EP1000725A1 (de) 2000-05-17

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